package com.insist.saki.util;

import java.security.MessageDigest;

/**
 * Created by Administrator on 2016/5/10.
 */
public class MD5Util {
        public final static String MD5(String s) {
            char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
            try {
                byte[] btInput = s.getBytes();
                // 获得MD5摘要算法的 MessageDigest 对象
                MessageDigest mdInst = MessageDigest.getInstance("MD5");
                // 使用指定的字节更新摘要
                mdInst.update(btInput);
                // 获得密文
                byte[] md = mdInst.digest();
                // 把密文转换成十六进制的字符串形式
                int j = md.length;
                char str[] = new char[j * 2];
                int k = 0;
                for (int i = 0; i < j; i++) {
                    byte byte0 = md[i];
                    str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                    str[k++] = hexDigits[byte0 & 0xf];
                }
                return new String(str);
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }
        public static void main(String[] args) {
            System.out.println(MD5Util.MD5("20121221"));
            System.out.println(MD5Util.MD5("加密"));
        }
}
